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Background  Pulmonary artery intimal sarcoma (PAIS) is a rare malignant tumor that was usually misdiagnosed as chronic pulmonary thromboembolism.    Case presentation  We previously reported a solitary fibrous tumor in the pulmonary artery presented with acute pulmonary embolism, which was identified by  99m Tc-Galacto-RGD 2  imaging. However, this patient had a recurrence in situ two-year after surgery, post-operative pathology revealed pulmonary artery intimal sarcoma. At one-year post-operation,  18 F-FDG PET/CT was performed for exclusion of tumor metastasis, which showed FDG avid lesion in the T5, T10, and L5 vertebral bodies, as well as in bilateral ilium and right ischium.    Conclusions  This is the first longitudinal observation of a solitary fibrous tumor (SFT) development into a pulmonary artery intimal sarcoma (PAIS) and presented with multiple bone metastases.

Longitudinal observation of solitary fibrous tumor translation into malignant pulmonary artery intimal sarcoma